# What can I do if keypad tones (DTMF) are not transmitted?

Dual Tone Multifrequency (DTMF) refers to the transmission of key tones over the telephone network to the receiving party.

#### **Default setting for all devices**

Open the configuration menu of your phone/VoIP adapter/VoIP app and select in the section **DTMF** and **via RTP (RFC2833**)

{% tabs %}
{% tab title="SNOM device" %}
In the web configuration menu, set **Identity 1** (sipgate) and **SIP** as well as the option **DTMF via SIP INFO** on **and**.

![sipgate help center-dmft3.png](/files/3e77c1b87ed701d0c5478341592ad9aa2856742a)

Additionally, in the tab **RTP** the option **RTP encryption** on **and** and the **Long SDP response** on **on** set.

![sipgate help center-dmft2.png](/files/693940bf68a831cc1e860efe9afbd4bbe46f37a7)
{% endtab %}

{% tab title="Siemens/Gigaset" %}
In the web configuration menu, go to **Settings → Telephony → Other VoIP settings** in the upper area **Transmission settings for DTMF transmission** on **RFC2833** set.

![sipgate help center-dmft1.png](/files/439ef1643d79975c600e6f2df56bbb952b01232b)

{% hint style="info" %}
**Important:** The **Siemens SL75** can only be used with SIP Info and is handled separately. Therefore, no change is necessary.
{% endhint %}
{% endtab %}

{% tab title="Asterisk" %}
If you work with Asterisk, change in the file **sip.conf** for the sipgate peer the line **dtmfmode** from I**nfo** on **rfc2833**.
{% endtab %}

{% tab title="Draytec Vigor" %}
Open the **configuration menu** of your router and switch to **Special** **settings** and **VoIP**. There set the option **CODEC, RTP and DTMF** on **DTMF (Dual Tone Multi Frequency)** on **Outband; payload type: 101**.
{% endtab %}

{% tab title="GS Wave" %}
In the menu, switch to **settings** and **Account settings** and select the corresponding SIP account there. Scroll down to the **codec settings** and click on **DTMF** Now select the option **RFC2833** and save the entry.
{% endtab %}
{% endtabs %}


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